var world_cities = [
"Tokyo, Japan",
"Seoul, South Korea",
"Mexico City, Mexico",
"New York City, USA",
"Mumbai, India",
"Jakarta, Indonesia",
"Sao Paulo, Brazil",
"Delhi, India",
"Osaka, Japan",
"Shanghai, China",
"Manila, Philippines",
"Los Angeles, USA",
"Calcutta, India",
"Moscow, Russia",
"Cairo, Egypt",
"Lagos, Nigeria",
"Buenos Aires, Argentina",
"London, United Kingdom",
"Beijing, China",
"Karachi, Pakistan",
"Dhaka, Bangladesh",
"Rio de Janeiro, Brazil",
"Tianjin, China",
"Paris, France",
"Istanbul, Turkey",
"Lima, Peru",
"Tehran, Iran",
"Bangkok, Thailand",
"Chicago, USA",
"Bogota, Colombia",
"Hyderabad, India",
"Chennai, India",
"Essen, Germany",
"Ho Chi Minh City, Vietnam",
"Hangzhou, China",
"Hong Kong, China",
"Lahore, Pakistan",
"Shenyang, China",
"Changchun, China",
"Bangalore, India",
"Harbin, China",
"Chengdu, China",
"Santiago, Chile",
"Guangzhou, China",
"St Petersburg, Russia",
"Kinshasa, DRC",
"Baghdad, Iraq",
"Jinan, China",
"Houston, USA",
"Toronto, Canada"];
